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T440 won't detect new battery

T430 and later, plus T530 and later series specific matters only
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thinkchaos
Posts: 5
Joined: Wed Jun 10, 2020 2:47 pm
Location: Isleworth, UK

T440 won't detect new battery

#1 Post by thinkchaos » Wed Jun 10, 2020 2:58 pm

Hi all,

I have a T440 here which is being a bit of trouble. The battery stopped charging so I figured it was duff and ordered a new one from Lenovo. Turned up, same issue. This is a 2-battery model. The front battery is sort of still limping along but the new one isn't detected at all. I tried getting a battery report with powercfg but it shows up empty serial number and capacity data, then windows 10 pops up a message saying that the second battery is not detected. I figured it was a driver issue but it's the same outcome on a Ubuntu USB stick. The machine itself was relatively happy for a couple of years. It is a frankenpad and has a T450 touchpad on it and a new 1080p IPS display I installed so I'd rather like to keep it, even though I use a T470 now.

I suspect the laptop has a hardware problem with it at this point. Is there anything obvious to look out for or any diagnostic steps I can take to identify and correct the issue?

I have suitable test gear, rework kit and skills available if it gets mucky :)

Edit: I have tried:

1. Power down, disable internal battery, remove AC, insert battery.
2. Magic reset hole in the bottom of the device
3. Updated drivers

It is showing in device manager for ~2 minutes before it reports it can't be found.

I'm thinking that it's probably the fuse on the battery +V line myself but I would have to take the entire unit to bits to get to it by the looks.

RealBlackStuff
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Re: T440 won't detect new battery

#2 Post by RealBlackStuff » Thu Jun 11, 2020 1:49 am

Try this:
remove/disconnect internal battery, insert only external battery and AC, then let it sit overnight.
Have you checked that the charger works properly?
Tried a more powerful one, if you have a 45W?
(with a round-to-square adapter, you could use older 90W adapters)
NOT a great day for a Guinness! (the Real Black Stuff).
Ireland is on FULL lockdown till December 2020!
Covid-19: Mask it or Casket!
Check out The Boardroom for Mods and Other Services.

thinkchaos
Posts: 5
Joined: Wed Jun 10, 2020 2:47 pm
Location: Isleworth, UK

Re: T440 won't detect new battery

#3 Post by thinkchaos » Thu Jun 11, 2020 5:07 am

Thanks. I will try that overnight tonight. I tried the 90W charger I use on my T470 dock. No difference. I've got about 5 chargers lying around.

thinkchaos
Posts: 5
Joined: Wed Jun 10, 2020 2:47 pm
Location: Isleworth, UK

Re: T440 won't detect new battery

#4 Post by thinkchaos » Fri Jun 12, 2020 3:08 am

Nope same issue. I'm going to dismantle it tonight and see if I can check the fuse. I've got a picture of the board and schematics so will start there. If it tests out ok I'll replace it with a T470 and chuck the steaming remains on ebay :)

thinkchaos
Posts: 5
Joined: Wed Jun 10, 2020 2:47 pm
Location: Isleworth, UK

Re: T440 won't detect new battery

#5 Post by thinkchaos » Sat Jun 13, 2020 4:05 pm

Nope fuse is good. It's being retired and ordering a new X1 for me and handing the T470 down. RIP T440.

RealBlackStuff
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Re: T440 won't detect new battery

#6 Post by RealBlackStuff » Sun Jun 14, 2020 12:05 am

Don't give up that easy!
Maybe someone with more electronics knowledge may pipe in.
But if you are selling the "steaming remains", I'm sure there are some forum members here who would love a decent IPS 1080 screen for their T440p...
NOT a great day for a Guinness! (the Real Black Stuff).
Ireland is on FULL lockdown till December 2020!
Covid-19: Mask it or Casket!
Check out The Boardroom for Mods and Other Services.

thinkchaos
Posts: 5
Joined: Wed Jun 10, 2020 2:47 pm
Location: Isleworth, UK

Re: T440 won't detect new battery

#7 Post by thinkchaos » Sun Jun 14, 2020 5:24 am

I've got the skills but not the time or motivation TBH. I will probably chuck it on ebay spares/repair. I have used to death at least 10 thinkpads in the last decade and a half :lol:

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